Update number... 6!

Changes:   

- New level cards unlocked by how you choose to tackle each challenge.

- Some updated character sprites.

- Footprints to the city map.

- Footstep sounds to the certain areas.

- Added some extra screen effects.

- Optimization to the challenge scenarios.

- New music to the final sequence.

- Minor updates to the maps.

- Increased camera zoom in the city area.

- More animation in the city.

Next up - Updating Part 2!